Texas Instruments UCC28070 – Interleaved Dual-Phase PFC Controller for High-Power AC-DC Conversion
The UCC28070 by IC Manufacturer is a highly integrated interleaved power factor correction (PFC) controller designed to enable efficient, low-noise AC-DC conversion in high-performance systems. Supporting continuous conduction mode (CCM) operation, the UCC28070 enables high power factor (>0.99) and minimal total harmonic distortion (THD) across broad load and input conditions.
Electrical Characteristics and Operating Parameters
| Parameter | Value | Unit |
|---|---|---|
| Number of Phases | 2 (Interleaved) | – |
| Operating Frequency Range | 10 to 500 | kHz |
| Input Voltage Range | 10.5 to 20 | V |
| Output Driver Voltage | ±0.95 | V |
| Current Sense Gain | 0.25 | V/A |
| UVLO Threshold | 12.5/10.5 | V (on/off) |
| Package | SOIC-16 | – |
Key Functional Features and Design Benefits
- Dual-Phase Interleaving: Reduces input/output ripple current and improves thermal performance for higher efficiency designs.
- Average Current Mode Control: Enables precise current regulation with stable feedback across varying line/load conditions.
- Programmable Frequency and Synchronization: Flexibility for EMI compliance and switching noise optimization.
- Comprehensive Protection Features: Integrated OVP, UVLO, and thermal fault detection improve reliability in harsh environments.
Typical Applications
- High-efficiency telecom rectifiers
- Industrial server power supplies
- Enterprise-class AC-DC front-end converters
- HVAC and lighting control power systems
- Medical and instrumentation power architectures
Frequently Asked Questions (FAQ)
What is interleaving in power factor correction?
Interleaving spreads the switching load across two phases to reduce ripple, lower EMI, and improve thermal distribution—ideal for high-power applications requiring tight regulation.
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Does UCC28070 support continuous conduction mode?
Yes, it operates in continuous conduction mode (CCM), delivering low harmonic distortion and high efficiency under varying load conditions.
What protection features are included in this controller?
The UCC28070 features undervoltage lockout (UVLO), overvoltage protection (OVP), brownout detection, and soft start—ensuring safe operation and system startup.
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Can it be synchronized with an external clock?
Yes, the controller supports external synchronization to mitigate beat frequencies and enable EMI optimization across system power stages.
What makes UCC28070 preferable to traditional single-phase PFC ICs?
It enables higher power output, reduced thermal stress, and better power quality via dual-phase interleaving and precise average current mode control, making it a robust solution for modern AC-DC systems.
